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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149a6e78c7919235e0a59769aa6a9681c2df3f8b1725f14b60cd5ed922ebe244' 
  AND token = 'kvZ2GKbATAoM4/UswSLtPovWQWlLHw/ehn1GRDv4llQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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