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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d61c209fcb3eb3e4e4d5194d88873808fc9474192e43ae3b58983da9da0a6e8' 
  AND token = 'Xdd4b1tbCiD6a2PY4eKJADtjahrts7UZM3pN/GXwd30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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