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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcea971ce7dab6107f13e23ff814f0ee1c33fcb184206cf5c84e210011bcbef' 
  AND token = '+q0k9fDOo4f4jC+JnMCNhzgQ08oO4GIx5+MZBYP0l90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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