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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b29959270159dd5a059837d3065c1f9892f76fe14f86c3a829499ec0b9c5810' 
  AND token = 'scnSCjSqA1L2zfyPg2D+KNXW0I8H6fGAhw94tCUjiC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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