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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad40d95c9d6189bf61ba30193760779af629a9da735f721fce2a707b0f5e671' 
  AND token = 'HpvGvWyCl/FCsHWqSShE83GaUv6L0dSIzJnLmEsoIJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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