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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b860fe59520348da66ebb239acd077f9630feaf7cde9a83dad6adccff69ab57' 
  AND token = '6bNJEEXAusi/pFPc4RN53ZxYgJ7bPbcoB51nbdSg+Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}