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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94232bcda56b295b2e392c235fe66d01d9754f7c8f0008706acee2ce2c7261c' 
  AND token = '4W5NW1u0zrPWuN4Vu4rp5NdAFVFY9w3ov7mrLMAHVvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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