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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeffa7815e6149eea3d9ba1bfe85b3a370c8d30a887dd6860b166a27de3e435b' 
  AND token = 'VSNIZFhCR05NwTQHMRdvS5Ij75/zCG0el/rS96Kb7Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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