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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806cc5c888b71fc443258f82413c1063ab1f7a37a0aafd9be2d51da69c057fd9' 
  AND token = '7NyQTXpV6iBPbSOwzO6MDTi3vdBr3ExbGCTNoUL2Ef0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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