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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabd348c852c19b7c0b7543ca26b42c59d4a1ccc153e23a44a2631da3a39839b' 
  AND token = 'nSygSiRCIeZuBfTDdwBSXiwuOk6CaJTbwFlSxSFBI3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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