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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c1bbef99bef9b60b4683e67a7e89025cdbaeb625fad5713219f3edadef1ce1' 
  AND token = 'PA6uk9p+f9eNW6/75SEK79YsmAv7Oya/RbUBWu0syFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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