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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01576fad7c4457d597888d63237a2408dab01e54931bcc0b21b22f9b85cae93' 
  AND token = 'FzRGhPJ3pzIn5OT71O5SimOmlQGC4TenaiMCpja0gmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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