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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe802da7acdb5177c757e37b00ab604f04118a2c447da7f2a0a1c9fcc543013b' 
  AND token = 'TRvwQPb+phTi4fChZBYHLWjBQLiunsaMnX62iyGMvRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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