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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cb5a79f937ff04906bf2b8fe38ff0cd77d67eac35a4d0ecc0325e20ba26221' 
  AND token = 'M9HoQ1kbtw+Bf7RJ9IQVH+MhHi/M99UkqRcm9VRDEd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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