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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cdecad9ded632047e1305b567dcc6b1477c5e704fc2153ef66ff27b5c04a1d' 
  AND token = 'FUsxP6BCGlemlPMOzg8tDAMM5TP4bnpsA9BF8hFt1Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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