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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce02c2e295962396bd9d7f9d84e2c967d59eefa6a00237ee95b15767b1cd0e5' 
  AND token = 'Lcrw/E1ygZcJhcyJKpFyffiREPyJbfUpAe7oYP82eq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00175

JSON explain

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