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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ad860a642f2ccc8dce7d940cf20a7db8f91217ea9002c9a3bbb421f355eead' 
  AND token = 'jidzp5yts7VSaAT0owzJnUDV3DzcamEl4Nyx0p+Iudw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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