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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fce484d5b616f6f8437cddbb9324b3110488a1a40345374450067d22fd76881' 
  AND token = 'zEvHYNVdHD0ClwPv/4ejMrE4cf4/oIPgvA6S4EhWGWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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