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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a222f4cfa7715a1ab988a08f1225aefa8a26100253e96953872f27af2106f3a' 
  AND token = 'RPQzy/uYaAWum1ahjwc+2s5pJgyU0A+apwzGhWJgqCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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