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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0a5199fb713598bc3da225f1c66ce56ffd3bf5b7ad7a0b3920fbe12c3c7e0c' 
  AND token = 'Ool1kIX1/fhoO7T8RE5nRCuFoR2pSOgpv7ECbZzsEPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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