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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873c75670e342e32a5f2d79c8f143e163a55f202b09c9a59ece995c257f7f94e' 
  AND token = '5hD2J5lRJSPMF2A4m7Ymejh+Tjjv0Tf/Xz1r1sQIM1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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