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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a22319b5b03004ed7dbffb4f150b7a51399fbd3bd05a6e8f1c6af216dc6cb5' 
  AND token = '75gpGDT2gJxtzzIxwi1tiVz1nGv/vbpd+jJ/fgxL6eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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