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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cfdfa0f45949d4bf14217a5adc064c9795bc000dad5df14f51f79b6f910828' 
  AND token = 'Yw346JplWgi6/FjmK3p2GimK/TCEDOFFOGYpbJiN/+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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