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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be0026ac2481f0e18273ab25638ad8e3f4f74e618817ce23e8ab560c42fed43' 
  AND token = 'E77hLWT9wG8rlJfZTNtQRvhaFYS3ek1/0oQwcOeE3dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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