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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519a14945ac04c00c02624a96c2b08d0315f304fa701fe99ade105efdfe46491' 
  AND token = 'ifFSVX4DTahZQ7PWJJCC/Qk9/zQmfVS8z0j0ch7KMtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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